EP2731720A1 - Method for coating a catalysed particulate filter and a particulate filter - Google Patents
Method for coating a catalysed particulate filter and a particulate filterInfo
- Publication number
- EP2731720A1 EP2731720A1 EP12728485.9A EP12728485A EP2731720A1 EP 2731720 A1 EP2731720 A1 EP 2731720A1 EP 12728485 A EP12728485 A EP 12728485A EP 2731720 A1 EP2731720 A1 EP 2731720A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- catalyst
- ammonia
- filter
- active
- catalysed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000011248 coating agent Substances 0.000 title claims description 6
- 238000000576 coating method Methods 0.000 title claims description 6
- 239000003054 catalyst Substances 0.000 claims abstract description 64
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 54
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 19
- 238000005192 partition Methods 0.000 claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000001257 hydrogen Substances 0.000 claims abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052763 palladium Inorganic materials 0.000 claims description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 5
- 229910052703 rhodium Inorganic materials 0.000 claims description 5
- 239000010948 rhodium Substances 0.000 claims description 5
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910021536 Zeolite Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000010457 zeolite Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000010953 base metal Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 150000002500 ions Chemical group 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 239000000725 suspension Substances 0.000 abstract description 9
- 229930195733 hydrocarbon Natural products 0.000 abstract description 5
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 3
- 238000006722 reduction reaction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229940001007 aluminium phosphate Drugs 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 241000269350 Anura Species 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- UNYSKUBLZGJSLV-UHFFFAOYSA-L calcium;1,3,5,2,4,6$l^{2}-trioxadisilaluminane 2,4-dioxide;dihydroxide;hexahydrate Chemical group O.O.O.O.O.O.[OH-].[OH-].[Ca+2].O=[Si]1O[Al]O[Si](=O)O1.O=[Si]1O[Al]O[Si](=O)O1 UNYSKUBLZGJSLV-UHFFFAOYSA-L 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- -1 viscosity improvers Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/82—Phosphates
- B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
- B01J29/85—Silicoaluminophosphates (SAPO compounds)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9463—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick
- B01D53/9468—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick in different layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
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- B01J35/56—
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0244—Coatings comprising several layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0246—Coatings comprising a zeolite
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1021—Platinum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1023—Palladium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
- B01D2255/1025—Rhodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20738—Iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20761—Copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/915—Catalyst supported on particulate filters
- B01D2255/9155—Wall flow filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0027—Powdering
- B01J37/0036—Grinding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0219—Coating the coating containing organic compounds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
- F01N2510/063—Surface coverings for exhaust purification, e.g. catalytic reaction zeolites
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a multifunctional
- the invention is a method for the preparation of a
- TWC three way catalyst
- SCR selective catalytic reduction
- the multifunctional catalysed filter is in particular useful for the cleaning of exhaust gas from lean burn gasoline engines, such as the gasoline direct injection (GDI) engine.
- GDI gasoline direct injection
- GDI engines generate more carbonaceous soot than gasoline premixed injection engines.
- Euro 5+ Diesel legislation is expected to be used for GDI in the future with a particulate mass limit at 4.5mg/km, which requires filtration of the engine exhaust in order to reach the above limit.
- filters for use in automotive applications are the wall flow type filter consisting of honeycombed
- Gas inlet channels are open at their gas inlet side and blocked at the opposite outlet end and the gas outlet channels are open at the outlet end and blocked the inlet end, so that a gas stream entering the wall flow filter is forced through the partition walls before into the outlet channels.
- exhaust gas from gasoline engines contains nitrogen oxides (NOx) , carbon monoxide and unburnt hydrocarbons, which are chemical compounds
- Catalysts being active in the removal or reduction of NOx, carbon monoxide and hydrocarbons to harmless compounds are per se known in the art.
- Patent literature discloses numerous cleaning systems comprising separate catalyst units for the removal of harmful compounds from engine exhaust gas. Also known in the art are exhaust gas particulate filters coated with catalysts catalysing oxidation of hydrocarbons and particulate matter together with selective catalytic reduction (SCR) of NOx by reaction with ammonia being added as such or as precursor thereof into the exhaust gas.
- SCR selective catalytic reduction
- catalysts are segmentarily or zone coated in different zones of the filter. Segmentary or zone coating of different catalysts on the filter is an expensive and difficult preparation process.
- the present invention suggests an easier method for the preparation of particulate filers catalysed with different catalysts for the selective reduction of nitrogen oxides with ammonia and removal of hydrocarbons, carbon monoxide and excess ammonia.
- the invention provides a method of preparation of a catalysed wall flow filter, comprising the steps of a) providing a wall flow filter body with a plurality longitudinal inlet flow channels and outlet flow channels separated by gas permeable porous partition walls; b) providing a catalyst washcoat comprising a first
- catalyst composition being active in reaction of nitrogen oxides with carbon monoxide and hydrogen to ammonia and a second catalyst composition being active in selective reduction of nitrogen oxides by reaction with ammonia to nitrogen, the first catalyst composition having a mode particle size being larger than the average pore diameter of the porous partition walls and the second catalyst composition having a mode particle size smaller than the average pore diameter of the porous partition walls; c) coating the filter body with the catalyst washcoat by introduction of the washcoat into inlet end of the inlet channels; and d) drying and heat treating the coated filter body to obtain the catalysed particulate filter.
- NOx +H 2 /CO NH 3 +C0 2 +H 2 0 are palladium, platinum, a mixture of palladium and rhodium and a mixture of palladium, platinum and rhodium.
- These catalysts catalyse the ammonia formation under rich burn operating conditions of the gasoline engine, i.e.
- Palladium is the preferred catalyst with the highest ammonia formation.
- Ammonia being thus formed within the inlet channels by the above reaction permeates through the partition walls of the filter into the outlet channels and is during the rich operating conditions adsorbed in the SCR catalyst in the outlet flow channels.
- Both the ammonia forming catalyst and the SCR catalyst are preferably deposited on the partition walls on the sides facing the inlet channel and the outlet channel,
- the SCR catalyst is also distributed within the pores of the walls.
- NOx being present in the exhaust gas reacts with the ammonia stored in the SCR catalyst by the following
- SCR catalysts are per se in the art.
- the preferred catalyst being active in the selective reduction of
- nitrogen oxides comprises at least one of a zeolite, silica aluminum phosphate, an ion exchanged zeolite, aluminum phosphate promoted with iron and/or copper, more base metal oxides.
- a further preferred SCR catalyst for use in the invention is a silica aluminium phosphate with chabazite structure, such as SAPO 34, promoted with copper and/or iron.
- the wall flow filter comprises in an embodiment of the invention additionally an ammonia oxidation catalyst arranged in each outlet flow channel at least in the region of the outlet end of the filter.
- a preferred ammonia oxidation catalyst comprises palladium, platinum or a mixture thereof.
- ammonia is oxidised to nitrogen and water.
- the ammonia oxidation catalyst may be deposited directly on the partition wall in the outlet channels of the filter in the outlet region or provided as surface layer on surface of the SCR catalyst layer.
- the invention provides additionally a catalysed wall flow filter being prepared in accordance with the above
- the catalysts being usually in particle form are milled or agglomerated to the required particle size and suspended in water or organic solvents, optionally with addition of binders, viscosity improvers, foaming agents or other processing aids.
- the filter is then washcoated according to common practice, including applying vacuum in the filter, pressurizing the washcoat or by dip coating.
- the amount of the first catalyst coated on the filter is typically 10 to 100 g/1, and the amount of the second catalyst on the filter is typically 10 to 140g/l.
- the total catalyst loading on the filter is typically in the range of 40 to 200 g/1.
- suitable filter materials for use in the invention are silicon carbide, aluminium titanate,
- a suspension of the first catalyst composition is in a first step prepared from a powder mixture of palladium and rhodium deposited on cerium oxide and alumina particles with a mode particle size larger than the filter wall mean pore size.
- a suspension of the mixture first catalyst is prepared by mixing 20 g of these powders in 40 ml demineralised water pr liter filter.
- a dispersing agent Zephrym PD-7000 and an antifoam agent are added.
- the mode particle sizes of the final suspension must be larger than the mean pore diameter of the pores in the wall of the wall flow filter
- a suspension of a second catalyst is made by mixing and dispersing 100 g of silica aluminium phosphate SAPO-34 promoted with 2% copper in 200 ml demineralised water pr liter filter. A dispersing agent Zephrym PD-7000 and an antifoam agent are added. The suspension is milled in a bead mill. The mode particle sizes must be smaller than the mean pore diameter of the pores in the wall of the wall flow filter The suspensions of the first catalyst and the second catalyst are then mixed to one suspension.
- a high porosity (approximately 60% and wall mean pore size approx 18 ⁇ ) conventionally plugged SiC wall flow filter is used.
- the mixed suspensions of first and the second catalyst is washcoated from the filters the inlet end of the filters dispersions side by standard washcoat methods side, dried and calcined at 750°C
Abstract
Method for the preparation of a wall flow particulate filter catalysed at its inlet side with a first catalyst having activity in the removal of residual hydrocarbons and carbon monoxide and catalysing at rich burn engine operation conditions the reaction of nitrogen oxides with hydrogen and/or carbon monoxide to ammonia and catalysed at its outlet side with a second catalyst having activity in the selective reduction of NOx by reaction with ammonia being formed in the inlet side. The method involves the provision of a first catalyst having a particle size larger than the filter wall mean pore size, and a second catalyst having a particle size smaller than the filter wall mean pore size, and mixing the first and second catalyst into one suspension, which is used for washcoating from the inlet end. The second catalyst thereby diffuses into the partition wall.
Description
Title:
METHOD FOR COATING A CATALYSED PARTICULATE FILTER AND A PARTICULATE FILTER
The present invention relates to a multifunctional
catalysed engine exhaust particulate filter. In particular, the invention is a method for the preparation of a
multifunctional catalysed particulate filter being
catalysed with a three way catalyst (TWC) and a catalyst being active in removing nitrogen oxides by the known NH3 - selective catalytic reduction (SCR) process, and optionally with a catalyst having activity in the oxidation of excess ammonia to nitrogen.
The multifunctional catalysed filter is in particular useful for the cleaning of exhaust gas from lean burn gasoline engines, such as the gasoline direct injection (GDI) engine.
GDI engines generate more carbonaceous soot than gasoline premixed injection engines. In Europe the Euro 5+ Diesel legislation is expected to be used for GDI in the future with a particulate mass limit at 4.5mg/km, which requires filtration of the engine exhaust in order to reach the above limit.
Typically, filters for use in automotive applications are the wall flow type filter consisting of honeycombed
structured body, wherein particulate matter is captured on or in partition walls of the honeycomb structure. These filters have a plurality longitudinal flow channels
separated by gas permeable partition walls. Gas inlet channels are open at their gas inlet side and blocked at
the opposite outlet end and the gas outlet channels are open at the outlet end and blocked the inlet end, so that a gas stream entering the wall flow filter is forced through the partition walls before into the outlet channels.
In addition to soot particles, exhaust gas from gasoline engines contains nitrogen oxides (NOx) , carbon monoxide and unburnt hydrocarbons, which are chemical compounds
representing a health and environmental risk and must be reduced or removed from the exhaust gas.
Catalysts being active in the removal or reduction of NOx, carbon monoxide and hydrocarbons to harmless compounds are per se known in the art.
Patent literature discloses numerous cleaning systems comprising separate catalyst units for the removal of harmful compounds from engine exhaust gas. Also known in the art are exhaust gas particulate filters coated with catalysts catalysing oxidation of hydrocarbons and particulate matter together with selective catalytic reduction (SCR) of NOx by reaction with ammonia being added as such or as precursor thereof into the exhaust gas.
Multifunctional diesel particulate filters coated with different catalysts catalysing the above mentioned
reactions are also known in the art. In the known multifunctional filters, the different
catalysts are segmentarily or zone coated in different zones of the filter.
Segmentary or zone coating of different catalysts on the filter is an expensive and difficult preparation process. Compared to known technique, the present invention suggests an easier method for the preparation of particulate filers catalysed with different catalysts for the selective reduction of nitrogen oxides with ammonia and removal of hydrocarbons, carbon monoxide and excess ammonia.
Thus, the invention provides a method of preparation of a catalysed wall flow filter, comprising the steps of a) providing a wall flow filter body with a plurality longitudinal inlet flow channels and outlet flow channels separated by gas permeable porous partition walls; b) providing a catalyst washcoat comprising a first
catalyst composition being active in reaction of nitrogen oxides with carbon monoxide and hydrogen to ammonia and a second catalyst composition being active in selective reduction of nitrogen oxides by reaction with ammonia to nitrogen, the first catalyst composition having a mode particle size being larger than the average pore diameter of the porous partition walls and the second catalyst composition having a mode particle size smaller than the average pore diameter of the porous partition walls; c) coating the filter body with the catalyst washcoat by introduction of the washcoat into inlet end of the inlet channels; and
d) drying and heat treating the coated filter body to obtain the catalysed particulate filter.
The advantage of the second catalyst has an mode particle size less than the mean pore diameter of the partition walls and the first catalyst particles have a larger mode particle size than the mean pore diameter of the walls is to allow the second catalyst particles to diffuse
effectively into the partition walls and to prevent the first catalyst from diffusing into the channels where the specific catalytic activity is not desired.
It is then possible to coat the filter body with different catalysts inlet and outlet flow channels with a single washcoat .
Useful catalysts for the reaction of NOx to ammonia by the following reaction:
NOx +H2/CO = NH3 +C02 +H20 are palladium, platinum, a mixture of palladium and rhodium and a mixture of palladium, platinum and rhodium.
These catalysts catalyse the ammonia formation under rich burn operating conditions of the gasoline engine, i.e.
λ<1. Palladium is the preferred catalyst with the highest ammonia formation.
Ammonia being thus formed within the inlet channels by the above reaction permeates through the partition walls of the filter into the outlet channels and is during the rich
operating conditions adsorbed in the SCR catalyst in the outlet flow channels.
Both the ammonia forming catalyst and the SCR catalyst are preferably deposited on the partition walls on the sides facing the inlet channel and the outlet channel,
respectively. Because of it particle size being less than the particle size of the pore diameters in partition walls, the SCR catalyst is also distributed within the pores of the walls.
In a subsequent lean burn operation cycle of the engine, NOx being present in the exhaust gas reacts with the ammonia stored in the SCR catalyst by the following
reaction:
NOx + NH3 = N2 + H20
As already mentioned above, SCR catalysts are per se in the art. For use in the invention, the preferred catalyst being active in the selective reduction of
nitrogen oxides comprises at least one of a zeolite, silica aluminum phosphate, an ion exchanged zeolite, aluminum phosphate promoted with iron and/or copper, more base metal oxides.
A further preferred SCR catalyst for use in the invention is a silica aluminium phosphate with chabazite structure, such as SAPO 34, promoted with copper and/or iron. In order to remove the excess ammonia having not reacted with NOx , the wall flow filter comprises in an embodiment of the invention additionally an ammonia oxidation catalyst
arranged in each outlet flow channel at least in the region of the outlet end of the filter.
A preferred ammonia oxidation catalyst comprises palladium, platinum or a mixture thereof.
By contact with the selective ammonia oxidation catalyst being coated on the SCR catalyst, ammonia is oxidised to nitrogen and water.
The ammonia oxidation catalyst may be deposited directly on the partition wall in the outlet channels of the filter in the outlet region or provided as surface layer on surface of the SCR catalyst layer.
The invention provides additionally a catalysed wall flow filter being prepared in accordance with the above
disclosed inventive preparation method. When preparing the washcoats for use in the invention, the catalysts being usually in particle form are milled or agglomerated to the required particle size and suspended in water or organic solvents, optionally with addition of binders, viscosity improvers, foaming agents or other processing aids.
The filter is then washcoated according to common practice, including applying vacuum in the filter, pressurizing the washcoat or by dip coating.
The amount of the first catalyst coated on the filter is typically 10 to 100 g/1, and the amount of the second
catalyst on the filter is typically 10 to 140g/l. The total catalyst loading on the filter is typically in the range of 40 to 200 g/1. Examples of suitable filter materials for use in the invention are silicon carbide, aluminium titanate,
cordierite, alumina, mullite or combinations thereof.
Example
A suspension of the first catalyst composition is in a first step prepared from a powder mixture of palladium and rhodium deposited on cerium oxide and alumina particles with a mode particle size larger than the filter wall mean pore size.
A suspension of the mixture first catalyst is prepared by mixing 20 g of these powders in 40 ml demineralised water pr liter filter. A dispersing agent Zephrym PD-7000 and an antifoam agent are added. The mode particle sizes of the final suspension must be larger than the mean pore diameter of the pores in the wall of the wall flow filter
A suspension of a second catalyst is made by mixing and dispersing 100 g of silica aluminium phosphate SAPO-34 promoted with 2% copper in 200 ml demineralised water pr liter filter. A dispersing agent Zephrym PD-7000 and an antifoam agent are added. The suspension is milled in a bead mill. The mode particle sizes must be smaller than the mean pore diameter of the pores in the wall of the wall flow filter
The suspensions of the first catalyst and the second catalyst are then mixed to one suspension.
A high porosity (approximately 60% and wall mean pore size approx 18 μιη) conventionally plugged SiC wall flow filter is used.
The mixed suspensions of first and the second catalyst is washcoated from the filters the inlet end of the filters dispersions side by standard washcoat methods side, dried and calcined at 750°C
Claims
1. A method of preparation of a catalysed wall flow filter, comprising the steps of a) providing a wall flow filter body with a plurality longitudinal inlet flow channels and outlet flow channels separated by gas permeable porous partition walls; b) providing a catalyst washcoat comprising a first
catalyst composition being active in reaction of nitrogen oxides with carbon monoxide and hydrogen to ammonia and a second catalyst composition being active in selective reduction of nitrogen oxides by reaction with ammonia to nitrogen, the first catalyst composition having a mode particle size being larger than the average pore diameter of the porous partition walls and the second catalyst composition having a mode particle size smaller than the average pore diameter of the porous partition walls; c) coating the filter body with the catalyst washcoat by introduction of the washcoat into inlet end of the inlet channels; and d) drying and heat treating the coated filter body to obtain the catalysed particulate filter.
2. The method of claim 1, wherein the catalyst being active in conversion of nitrogen oxides to ammonia includes palladium, platinum, a mixture of palladium and rhodium and a mixture of palladium, platinum and rhodium.
3. The method of claim 1, wherein the catalyst being active in conversion of nitrogen oxides to ammonia consists of palladium.
4. The method according to anyone of claims 1 to 3, wherein the catalyst being active in the selective
reduction of nitrogen oxides comprises at least one of a zeolite, a silica aluminum phosphate, an ion exchanged zeolite, silica aluminum phosphate promoted with iron and/or copper, and one or more base metal oxides.
5. The method according to anyone of the preceding claims, further comprising the steps of
providing a second washcoat containing a catalyst
composition being active in the selective oxidation of ammonia; and
coating a part of the outlet channels at region at the outlet end with the second washcoat.
6. A catalysed wall flow filter being prepared in accordance with anyone of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA201100535 | 2011-07-13 | ||
PCT/EP2012/061331 WO2013007468A1 (en) | 2011-07-13 | 2012-06-14 | Method for coating a catalysed particulate filter and a particulate filter |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2731720A1 true EP2731720A1 (en) | 2014-05-21 |
Family
ID=46320941
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12728485.9A Withdrawn EP2731720A1 (en) | 2011-07-13 | 2012-06-14 | Method for coating a catalysed particulate filter and a particulate filter |
Country Status (10)
Country | Link |
---|---|
US (1) | US20140134063A1 (en) |
EP (1) | EP2731720A1 (en) |
JP (1) | JP6395603B2 (en) |
KR (1) | KR20140033465A (en) |
CN (1) | CN103796756B (en) |
BR (1) | BR112014000488A2 (en) |
CA (1) | CA2837918A1 (en) |
MX (1) | MX2014000498A (en) |
RU (1) | RU2609005C2 (en) |
WO (1) | WO2013007468A1 (en) |
Families Citing this family (4)
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CN109590018B (en) * | 2013-03-15 | 2022-06-03 | 庄信万丰股份有限公司 | Catalyst for treating exhaust gas |
EP3257571A1 (en) | 2016-06-13 | 2017-12-20 | Umicore AG & Co. KG | Particle filter with integrated nox storage and h2s blocking funktion |
DE102018108346A1 (en) * | 2018-04-09 | 2019-10-10 | Umicore Ag & Co. Kg | Coated wall flow filter |
JP7178432B2 (en) * | 2021-01-18 | 2022-11-25 | 本田技研工業株式会社 | exhaust purification filter |
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ATE148368T1 (en) * | 1991-04-22 | 1997-02-15 | Corning Inc | CATALYTIC REACTOR SYSTEM |
RU2059841C1 (en) * | 1993-08-24 | 1996-05-10 | Малое предприятие "Технология" | Filter for cleaning exhaust gases in internal combustion engine |
US5981427A (en) * | 1996-09-04 | 1999-11-09 | Engelhard Corporation | Catalyst composition |
JP3888171B2 (en) * | 2002-01-28 | 2007-02-28 | トヨタ自動車株式会社 | Exhaust purification device for internal combustion engine, and catalyst carrying method for carrying catalyst on particulate filter |
US7332135B2 (en) * | 2002-10-22 | 2008-02-19 | Ford Global Technologies, Llc | Catalyst system for the reduction of NOx and NH3 emissions |
US6946013B2 (en) * | 2002-10-28 | 2005-09-20 | Geo2 Technologies, Inc. | Ceramic exhaust filter |
US7198764B2 (en) * | 2003-03-05 | 2007-04-03 | Delphi Technologies, Inc. | Gas treatment system and a method for using the same |
US8661794B2 (en) * | 2003-08-29 | 2014-03-04 | Dow Global Technologies Llc | Diesel exhaust filter |
DE102004040551A1 (en) * | 2004-08-21 | 2006-02-23 | Umicore Ag & Co. Kg | Process for coating a wall-flow filter with a coating composition |
ATE464458T1 (en) * | 2007-02-23 | 2010-04-15 | Umicore Ag & Co Kg | CATALYTICALLY ACTIVATED DIESEL PARTICLE FILTER WITH AMMONIA BLOCKING EFFECT |
JP2008212799A (en) * | 2007-03-01 | 2008-09-18 | Okayama Univ | Catalyst for performing catalytic reduction of nitrogen oxide in exhaust gas and method |
WO2008122023A1 (en) * | 2007-04-02 | 2008-10-09 | Geo2 Technologies, Inc | A selective catalytic reduction filter and method of using same |
WO2009087819A1 (en) * | 2008-01-08 | 2009-07-16 | Honda Motor Co., Ltd. | Exhaust emission control device for internal combustion engine |
US20100101221A1 (en) * | 2008-10-28 | 2010-04-29 | Caterpillar Inc. | CATALYSTS, SYSTEMS, AND METHODS FOR REDUCING NOx IN AN EXHAUST GAS |
US8844274B2 (en) * | 2009-01-09 | 2014-09-30 | Ford Global Technologies, Llc | Compact diesel engine exhaust treatment system |
JP5531501B2 (en) * | 2009-08-21 | 2014-06-25 | 三菱自動車工業株式会社 | Exhaust gas purification device |
US8246922B2 (en) * | 2009-10-02 | 2012-08-21 | Basf Corporation | Four-way diesel catalysts and methods of use |
CN102762827B (en) * | 2010-04-14 | 2014-12-24 | 尤米科尔股份公司及两合公司 | Reduction-catalyst-coated diesel particle filter having improved characteristics |
FR2964413B1 (en) * | 2010-09-02 | 2016-07-01 | Peugeot Citroen Automobiles Sa | PARTICLE FILTER HAVING THREE CATALYTIC COATINGS |
MX2013004637A (en) * | 2010-11-02 | 2013-06-05 | Topsoe Haldor As | Method for the preparation of a catalysed particulate filter and catalysed particulate filter. |
-
2012
- 2012-06-14 CA CA2837918A patent/CA2837918A1/en not_active Abandoned
- 2012-06-14 CN CN201280034845.1A patent/CN103796756B/en not_active Expired - Fee Related
- 2012-06-14 KR KR1020137035014A patent/KR20140033465A/en active Search and Examination
- 2012-06-14 EP EP12728485.9A patent/EP2731720A1/en not_active Withdrawn
- 2012-06-14 WO PCT/EP2012/061331 patent/WO2013007468A1/en active Application Filing
- 2012-06-14 JP JP2014519479A patent/JP6395603B2/en active Active
- 2012-06-14 BR BR112014000488A patent/BR112014000488A2/en not_active Application Discontinuation
- 2012-06-14 MX MX2014000498A patent/MX2014000498A/en not_active Application Discontinuation
- 2012-06-14 RU RU2014104853A patent/RU2609005C2/en not_active IP Right Cessation
- 2012-06-14 US US14/128,972 patent/US20140134063A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
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See references of WO2013007468A1 * |
Also Published As
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WO2013007468A1 (en) | 2013-01-17 |
RU2609005C2 (en) | 2017-01-30 |
MX2014000498A (en) | 2014-02-19 |
CA2837918A1 (en) | 2013-01-17 |
US20140134063A1 (en) | 2014-05-15 |
JP6395603B2 (en) | 2018-09-26 |
KR20140033465A (en) | 2014-03-18 |
CN103796756A (en) | 2014-05-14 |
CN103796756B (en) | 2016-11-16 |
BR112014000488A2 (en) | 2017-02-21 |
RU2014104853A (en) | 2015-08-20 |
JP2014525826A (en) | 2014-10-02 |
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